Bi‐MOF Derived Porous Rod‐Like C/Bi ₂ O ₃ for Efficiently Photocatalytic Degradation of 2,4‐DCP

ABSTRACT

2,4‐Dichlorophenol (2,4‐DCP) is a highly toxic and refractory priority water pollutant. Bismuth‐based MOFs(Bi‐MOFs) are promising photocatalytic precursors due to their high specific surface area, but their practical applications are severely limited by a wide band gap, low photogenerated carrier efficiency, and poor visible‐light absorption, necessitating urgent band structure modulation. This study presents a facile calcination strategy using Bi‐BTC as a precursor to successfully fabricate a porous rod‐like carbon‐doped Bi ₂ O ₃ (C/Bi ₂ O ₃ ) photocatalyst. Carbon doping effectively modulates the band structure of the material, narrowing the band gap to 2.72 eV and significantly improving charge separation and transfer efficiency. The optimal sample (C/Bi ₂ O ₃ ‐400‐60) achieved 97.5% degradation of 2,4‐DCP within 30 min, with a reaction rate nearly five times higher than that of pristine Bi‐BTC. Mechanistic studies confirmed that electrons (e ⁻ ) and superoxide radicals (·O ₂ ⁻ ) are the dominant reactive species, while ¹ O ₂ and h ⁺ also partially participate in the degradation process. Furthermore, the catalyst demonstrated broad applicability for the degradation of various phenolic pollutants.